Ag和Pd及其离子对TiO_2光催化分解CH_3CHO的影响

THE EFFECTS OF Ag, Pd AND Ag +, Pd 2+ ON PHOTODE GRADATION OF CH 3CHO CATALYZED BY TiO 2

当用能量大于其禁带宽度的光照射通有氧气的ＴｉＯ２悬浮液时，在ＴｉＯ２微粒表面会产生反应活性很高的空穴和Ｏ２－、Ｈ２Ｏ２等多种活性氧．在上一篇文章中［１］我们已报道了在通氧气和紫外光照的条件下，向ＴｉＯ２悬浮液中加入少量Ａｇ＋或Ｐｄ２＋，将会大幅度提高...

Photodegradation of CH 3CHO catalyzed by TiO 2 was accelerated after Ag + or Pd 2+ was added into TiO 2 aqueous suspension. Under nitrogen, Ag + and Pd 2+ only acted as electron acceptors to separate electron and hole well, while under oxygen, Ag + and Pd 2+ not only acted as electron acceptors but also increased H 2O 2 produced by illumination in the suspension. But photocatalytic activity of TiO 2 was only improved under oxygen after surface modification was used. Our results show that the concentration of H 2O 2 in the suspension has great effect on photodegradation of CH 3CHO assisted by TiO 2.